<?php

if (!defined('BASEPATH'))
    exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package        CodeIgniter
 * @author        ExpressionEngine Dev Team
 * @copyright    Copyright (c) 2006 - 2012 EllisLab, Inc.
 * @license        http://codeigniter.com/user_guide/license.html
 * @link        http://codeigniter.com
 * @since        Version 2.0
 * @filesource    
 */
// ------------------------------------------------------------------------

/**
 * CodeIgniter APC Caching Class 
 *
 * @package        CodeIgniter
 * @subpackage    Libraries
 * @category    Core
 * @author        ExpressionEngine Dev Team
 * @link        
 */
class CI_Cache_apc extends CI_Driver {

    /**
     * Get 
     *
     * Look for a value in the cache.  If it exists, return the data 
     * if not, return FALSE
     *
     * @param     string    
     * @return     mixed        value that is stored/FALSE on failure
     */
    public function get($id) {
        $data = apc_fetch($id);

        return (is_array($data)) ? $data[0] : FALSE;
    }

    // ------------------------------------------------------------------------    

    /**
     * Cache Save
     *
     * @param     string        Unique Key
     * @param     mixed        Data to store
     * @param     int            Length of time (in seconds) to cache the data
     *
     * @return     boolean        true on success/false on failure
     */
    public function save($id, $data, $ttl = 60) {
        return apc_store($id, array($data, time(), $ttl), $ttl);
    }

    // ------------------------------------------------------------------------

    /**
     * Delete from Cache
     *
     * @param     mixed        unique identifier of the item in the cache
     * @param     boolean        true on success/false on failure
     */
    public function delete($id) {
        return apc_delete($id);
    }

    // ------------------------------------------------------------------------

    /**
     * Clean the cache
     *
     * @return     boolean        false on failure/true on success
     */
    public function clean() {
        return apc_clear_cache('user');
    }

    // ------------------------------------------------------------------------

    /**
     * Cache Info
     *
     * @param     string        user/filehits
     * @return     mixed        array on success, false on failure    
     */
    public function cache_info($type = NULL) {
        return apc_cache_info($type);
    }

    // ------------------------------------------------------------------------

    /**
     * Get Cache Metadata
     *
     * @param     mixed        key to get cache metadata on
     * @return     mixed        array on success/false on failure
     */
    public function get_metadata($id) {
        $stored = apc_fetch($id);

        if (count($stored) !== 3) {
            return FALSE;
        }

        list($data, $time, $ttl) = $stored;

        return array(
            'expire' => $time + $ttl,
            'mtime' => $time,
            'data' => $data
        );
    }

    // ------------------------------------------------------------------------

    /**
     * is_supported()
     *
     * Check to see if APC is available on this system, bail if it isn't.
     */
    public function is_supported() {
        if (!extension_loaded('apc') OR ini_get('apc.enabled') != "1") {
            log_message('error', 'The APC PHP extension must be loaded to use APC Cache.');
            return FALSE;
        }

        return TRUE;
    }

    // ------------------------------------------------------------------------
}

// End Class

/* End of file Cache_apc.php */
/* Location: ./system/libraries/Cache/drivers/Cache_apc.php */
